/**
  ******************************************************************************
  * @file    usbd_cdc_vcp.c
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    22-July-2011
  * @brief   Generic media access Layer.
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
  ******************************************************************************
  */ 

#ifdef USB_OTG_HS_INTERNAL_DMA_ENABLED 
#pragma     data_alignment = 4 
#endif /* USB_OTG_HS_INTERNAL_DMA_ENABLED */

/* Includes ------------------------------------------------------------------*/
#include "usbd_cdc_vcp.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
LINE_CODING linecoding =
  {
    115200, /* baud rate*/
    0x00,   /* stop bits-1*/
    0x00,   /* parity - none*/
    0x08    /* nb. of bits 8*/
  };


USART_InitTypeDef USART_InitStructure;

/* These are external variables imported from CDC core to be used for IN 
   transfer management. */
extern uint8_t  APP_Rx_Buffer []; /* Write CDC received data in this buffer.
                                     These data will be sent over USB IN endpoint
                                     in the CDC core functions. */
extern uint32_t APP_Rx_ptr_in;    /* Increment this pointer or roll it back to
                                     start address when writing received data
                                     in the buffer APP_Rx_Buffer. */

/* Private function prototypes -----------------------------------------------*/
static uint16_t VCP_Init     (void);
static uint16_t VCP_DeInit   (void);
static uint16_t VCP_Ctrl     (uint32_t Cmd, uint8_t* Buf, uint32_t Len);
static uint16_t VCP_DataTx   (uint8_t* Buf, uint32_t Len);
static uint16_t VCP_DataRx   (uint8_t* Buf, uint32_t Len);

static uint16_t VCP_COMConfig(uint8_t Conf);

CDC_IF_Prop_TypeDef VCP_fops = 
{
  VCP_Init,
  VCP_DeInit,
  VCP_Ctrl,
  VCP_DataTx,
  VCP_DataRx
};

/* Private functions ---------------------------------------------------------*/
/**
  * @brief  VCP_Init
  *         Initializes the Media on the STM32
  * @param  None
  * @retval Result of the opeartion (USBD_OK in all cases)
  */
static uint16_t VCP_Init(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  /* USART3 default configuration */
  /* USART3 configured as follow:
        - BaudRate = 115200 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - Parity Odd
        - Hardware flow control disabled
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_Odd;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

  /* Configure and enable the USART */


  

  /* Enable GPIO clock */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

  /* Enable UART clock */
  RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

  /* Connect PXx to USARTx_Tx*/
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3);

  /* Connect PXx to USARTx_Rx*/
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3);

  /* Configure USART Tx as alternate function  */
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

  GPIO_InitStructure.GPIO_Pin = GPIO_PinSource10;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  /* Configure USART Rx as alternate function  */
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Pin = GPIO_PinSource11;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  /* USART configuration */
  USART_Init(USART3, &USART_InitStructure);
    
  /* Enable USART */
  USART_Cmd(USART3, ENABLE);


  /* Enable the USART Receive interrupt */
  USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

  /* Enable USART Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  
  return USBD_OK;
}

/**
  * @brief  VCP_DeInit
  *         DeInitializes the Media on the STM32
  * @param  None
  * @retval Result of the opeartion (USBD_OK in all cases)
  */
static uint16_t VCP_DeInit(void)
{

  return USBD_OK;
}


/**
  * @brief  VCP_Ctrl
  *         Manage the CDC class requests
  * @param  Cmd: Command code            
  * @param  Buf: Buffer containing command data (request parameters)
  * @param  Len: Number of data to be sent (in bytes)
  * @retval Result of the opeartion (USBD_OK in all cases)
  */
static uint16_t VCP_Ctrl (uint32_t Cmd, uint8_t* Buf, uint32_t Len)
{ 
  switch (Cmd)
  {
  case SEND_ENCAPSULATED_COMMAND:
    /* Not  needed for this driver */
    break;

  case GET_ENCAPSULATED_RESPONSE:
    /* Not  needed for this driver */
    break;

  case SET_COMM_FEATURE:
    /* Not  needed for this driver */
    break;

  case GET_COMM_FEATURE:
    /* Not  needed for this driver */
    break;

  case CLEAR_COMM_FEATURE:
    /* Not  needed for this driver */
    break;

  case SET_LINE_CODING:
    linecoding.bitrate = (uint32_t)(Buf[0] | (Buf[1] << 8) | (Buf[2] << 16) | (Buf[3] << 24));
    linecoding.format = Buf[4];
    linecoding.paritytype = Buf[5];
    linecoding.datatype = Buf[6];
    /* Set the new configuration */
    VCP_COMConfig(OTHER_CONFIG);
    break;

  case GET_LINE_CODING:
    Buf[0] = (uint8_t)(linecoding.bitrate);
    Buf[1] = (uint8_t)(linecoding.bitrate >> 8);
    Buf[2] = (uint8_t)(linecoding.bitrate >> 16);
    Buf[3] = (uint8_t)(linecoding.bitrate >> 24);
    Buf[4] = linecoding.format;
    Buf[5] = linecoding.paritytype;
    Buf[6] = linecoding.datatype; 
    break;

  case SET_CONTROL_LINE_STATE:
    /* Not  needed for this driver */
    break;

  case SEND_BREAK:
    /* Not  needed for this driver */
    break;    
    
  default:
    break;
  }

  return USBD_OK;
}

/**
  * @brief  VCP_DataTx
  *         CDC received data to be send over USB IN endpoint are managed in 
  *         this function.
  * @param  Buf: Buffer of data to be sent
  * @param  Len: Number of data to be sent (in bytes)
  * @retval Result of the opeartion: USBD_OK if all operations are OK else VCP_FAIL
  */
static uint16_t VCP_DataTx (uint8_t* Buf, uint32_t Len)
{
  if (linecoding.datatype == 7)
  {
    APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(USART3) & 0x7F;
  }
  else if (linecoding.datatype == 8)
  {
    APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(USART3);
  }
  
  APP_Rx_ptr_in++;
  
  /* To avoid buffer overflow */
  if(APP_Rx_ptr_in == APP_RX_DATA_SIZE)
  {
    APP_Rx_ptr_in = 0;
  }  
  
  return USBD_OK;
}

/**
  * @brief  VCP_DataRx
  *         Data received over USB OUT endpoint are sent over CDC interface 
  *         through this function.
  *           
  *         @note
  *         This function will block any OUT packet reception on USB endpoint 
  *         untill exiting this function. If you exit this function before transfer
  *         is complete on CDC interface (ie. using DMA controller) it will result 
  *         in receiving more data while previous ones are still not sent.
  *                 
  * @param  Buf: Buffer of data to be received
  * @param  Len: Number of data received (in bytes)
  * @retval Result of the opeartion: USBD_OK if all operations are OK else VCP_FAIL
  */
static uint16_t VCP_DataRx (uint8_t* Buf, uint32_t Len)
{
  uint32_t i;
  
  for (i = 0; i < Len; i++)
  {
    USART_SendData(USART3, *(Buf + i) );
    while(USART_GetFlagStatus(USART3, USART_FLAG_TXE) == RESET); 
  } 
 
  return USBD_OK;
}

/**
  * @brief  VCP_COMConfig
  *         Configure the COM Port with default values or values received from host.
  * @param  Conf: can be DEFAULT_CONFIG to set the default configuration or OTHER_CONFIG
  *         to set a configuration received from the host.
  * @retval None.
  */
static uint16_t VCP_COMConfig(uint8_t Conf)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  if (Conf == DEFAULT_CONFIG)  
  {
    /* USART3 default configuration */
    /* USART3 configured as follow:
    - BaudRate = 115200 baud  
    - Word Length = 8 Bits
    - One Stop Bit
    - Parity Odd
    - Hardware flow control disabled
    - Receive and transmit enabled
    */
    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_Odd;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    
    /* Configure and enable the USART */

    /* Enable GPIO clock */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

    /* Enable UART clock */
    RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

    /* Connect PXx to USARTx_Tx*/
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3);

    /* Connect PXx to USARTx_Rx*/
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3);

    /* Configure USART Tx as alternate function  */
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

    GPIO_InitStructure.GPIO_Pin = GPIO_PinSource10;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    /* Configure USART Rx as alternate function  */
    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Pin = GPIO_PinSource11;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    /* USART configuration */
    USART_Init(USART3, &USART_InitStructure);

    /* Enable USART */
    USART_Cmd(USART3, ENABLE);
    
    /* Enable the USART Receive interrupt */
    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
  }
  else
  {
    /* set the Stop bit*/
    switch (linecoding.format)
    {
    case 0:
      USART_InitStructure.USART_StopBits = USART_StopBits_1;
      break;
    case 1:
      USART_InitStructure.USART_StopBits = USART_StopBits_1_5;
      break;
    case 2:
      USART_InitStructure.USART_StopBits = USART_StopBits_2;
      break;
    default :
      VCP_COMConfig(DEFAULT_CONFIG);
      return (USBD_FAIL);
    }
    
    /* set the parity bit*/
    switch (linecoding.paritytype)
    {
    case 0:
      USART_InitStructure.USART_Parity = USART_Parity_No;
      break;
    case 1:
      USART_InitStructure.USART_Parity = USART_Parity_Even;
      break;
    case 2:
      USART_InitStructure.USART_Parity = USART_Parity_Odd;
      break;
    default :
      VCP_COMConfig(DEFAULT_CONFIG);
      return (USBD_FAIL);
    }
    
    /*set the data type : only 8bits and 9bits is supported */
    switch (linecoding.datatype)
    {
    case 0x07:
      /* With this configuration a parity (Even or Odd) should be set */
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;
      break;
    case 0x08:
      if (USART_InitStructure.USART_Parity == USART_Parity_No)
      {
        USART_InitStructure.USART_WordLength = USART_WordLength_8b;
      }
      else 
      {
        USART_InitStructure.USART_WordLength = USART_WordLength_9b;
      }
      
      break;
    default :
      VCP_COMConfig(DEFAULT_CONFIG);
      return (USBD_FAIL);
    }
    
    USART_InitStructure.USART_BaudRate = linecoding.bitrate;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    
    /* Configure and enable the USART */
    /* Enable GPIO clock */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

    /* Enable UART clock */
    RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

    /* Connect PXx to USARTx_Tx*/
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3);

    /* Connect PXx to USARTx_Rx*/
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3);

    /* Configure USART Tx as alternate function  */
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

    GPIO_InitStructure.GPIO_Pin = GPIO_PinSource10;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    /* Configure USART Rx as alternate function  */
    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Pin = GPIO_PinSource11;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    /* USART configuration */
    USART_Init(USART3, &USART_InitStructure);

    /* Enable USART */
    USART_Cmd(USART3, ENABLE);
  }
  return USBD_OK;
}

/**
  * @brief  EVAL_COM_IRQHandler
  *         
  * @param  None.
  * @retval None.
  */
void EVAL_COM_IRQHandler(void)
{
  if (USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
  {
    /* Send the received data to the PC Host*/
    VCP_DataTx (0,0);
  }

  /* If overrun condition occurs, clear the ORE flag and recover communication */
  if (USART_GetFlagStatus(USART3, USART_FLAG_ORE) != RESET)
  {
    (void)USART_ReceiveData(USART3);
  }
}

/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
